Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q1. 

1)  60 days  2)  80 days 
3)  90 days  4)  120 days 
5)  None of these 
Answer : 90 days
Explanation : Total workers = 0.5Z * 2 M = 0.5 * (1.2 M) * 2 M = 1.2 M2 Total work = M2 * 108 = 1.2 M2 * No of days = > No of days = (M2 * 108) / (1.2 M2 ) = 90 days
Explanation : Total workers = 0.5Z * 2 M = 0.5 * (1.2 M) * 2 M = 1.2 M2 Total work = M2 * 108 = 1.2 M2 * No of days = > No of days = (M2 * 108) / (1.2 M2 ) = 90 days
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Q2. 

1)  33 days  2)  22 days 
3)  36 days  4)  44 days 
5)  None of the 
Answer : 33 days
Explanation :
M_{1} * D_{1} = M_{2} * D_{2}
Explanation :
Solutions:
Project A:
X * 88 = (X + 8) * 66
= > 88X = 66X + 8 * 66 = > 22X = 8 * 66 = > X = 24
Project B:
Y * (Y  1) = (Y + 6) * (Y  6)
Y^{2} – Y = Y^{2} – 6^{2}
= > Y = 36
Project C:
Z^{2} * 75 = M^{2} * 108
= > Z^{2} / M^{2} = 108/75
= > Z^{2} / M^{2} = 36/25
= > Z / M = 6/5
= > Z = 6/5 * M
= > Z = 1.2 M
24 * 88 = 64 * D2
= > D_{2} = (24 * 88)/64
= > D_{2} = 33 days
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Q3. 

1)  Rs.17000  2)  Rs.17500 
3)  Rs.18000  4)  Rs.18500 
5)  None of these 
Answer : Rs.17500
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Q4. 

1)  1:2  2)  1:3 
3)  3:4  4)  2:5 
5)  None of these 
Answer : 1:3
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Q5. 

1)  50%  2)  60% 
3)  70%  4)  80% 
5)  None of these 
Answer : 80%
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Q6. 

1)  6:5  2)  7:5 
3)  8:5  4)  9:5 
5)  None of these 
Answer : 7:5
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Q7. 

1)  118 : 163  2)  128 : 119 
3)  121 : 147  4)  163 : 118 
5)  None of these 
Answer : None of these
Explanation :
Explanation :
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Q8. 

1)  Rs. 98.5 lakhs  2)  Rs. 89.3 lakhs 
3)  Rs. 92.6 lakhs  4)  Can’t be determined 
5)  None of these 
Answer : Can’t be determined
Explanation :
Explanation :
As the percentage profits are different for different years, we can not find the total income
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Q9. 

1)  Rs. 74.8 Lakhs  2)  Rs. 85.5 Lakhs 
3)  Rs. 68.4 Lakhs  4)  Rs. 78.5 Lakhs 
5)  None of these 
Answer : Rs. 85.5 Lakhs
Explanation :
Explanation :
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Q10. 

1)  4 : 15  2)  7 : 12 
3)  9: 16  4)  Cannot determined 
5)  None of these 
Answer : 9: 16
Explanation :
Explanation :
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